/Engine/Source/Editor/UnrealEd/Public/EditorLevelUtils.h
Creates a new streaming level and adds it to a world
Returns the newly created level, or NULL on failure
static [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) * CreateNewStreamingLevelForWorld ( [UWorld](API\Runtime\Engine\Engine\UWorld) & World, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) > LevelStreamingClass, const [FString](API\Runtime\Core\Containers\FString) & DefaultFilename, bool bMoveSelectedActorsIntoNewLevel, [UWorld](API\Runtime\Engine\Engine\UWorld) * InTemplateWorld, bool bInUseSaveAs, [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< void([ULevel](API\Runtime\Engine\Engine\ULevel) *)> InPreSaveLevelOperation, const FTransform & InTransform )